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Quantum Many-Body Days – H. Nishimori & M. J. Savage

September 21 @ 11:00 am - 12:00 pm

The conference on Recent Progress in Many-Body Theories (RPMBT) will take place here at UNC in September 2022.
As a bridge program, this year we are hosting a series of virtual talks in September 2021: the Quantum Many-Body Days.
The format of these talks will be 45 minutes for presentation and 15 minutes for questions and discussion. Please see below links for more information.

Local organizing committee
J. Drut (Chair), G. Basar, A. Nicholson, S. Chandrasekharan, L. Mitas, and T. Papenbrock

Program schedule:
September 7th, 2021: Topology and gauge theories
“Emergent higher symmetry and topological order”
X.-G. Wen – 10am
Session chair: Drut
Introductory remarks: Ortiz
“Quantum information measure of space-time correlation”
X. Qi – 1pm
Session chair: Batista

September 14th, 2021: Machine learning and computational physics
“Reconstructing quantum states with generative models”
R. Melko – 10am
Session chair: Nicholson

Generative models are a powerful tool in unsupervised machine learning, where the goal is to learn the unknown probability distribution that underlies a data set. Recently, it has been demonstrated that modern generative models adopted from industry are powerful enough to reconstruct quantum states, given projective measurement data on individual qubits. These virtual reconstructions can then be studied with probes that may be unavailable to the original experiment. In this talk I will outline the strategy for quantum state reconstruction using generative models, and show examples on experimental data from a Rydberg atom quantum simulator. I will discuss the continuing theoretical development of the field, including the exploration of powerful autoregressive models for the reconstruction of mixed and time-evolved quantum states.

“Simulating strongly correlated systems with tensor networks”
F. Verstraete – 11am
Session chair: Ortiz

Tensor networks model the entanglement degrees of freedom of quantum many-body wavefunctions, and give rise to a powerful variational ansatz for simulating low-energy states of the corresponding quantum Hamiltonians. This talk will highlight recent advances in the field of tensor networks, including entanglement scaling methods, state of the art PEPS algorithms, and the description of symmetries in topological phases of matter.

September 21st, 2021: Quantum computation / quantum information
“Quantum simulation by quantum annealing”
H. Nishimori – 10am
Session chair: Papenbrock

After a brief introduction to quantum annealing and an overview of the status of quantum simulation by quantum annealing, I describe our recent quantum simulations using the D-Wave quantum annealers on the Kibble-Zurek mechanism for defect formation in a quantum chain and the Griffiths-McCoy singularity for low-dimensional diluted random magnets.

“Quantum Computing for Nuclear Physics”
M. J. Savage – 11am
Session chair: Batista

Theoretical predictions of the properties and dynamics of quantum field theories and quantum many-body systems of importance to nuclear physics research, from dense and/or non-equilibrium matter, to systems of neutrinos, to jet production in heavy-ion collisions, require, in many instances, computational capabilities beyond the realm of classical computing. As highlighted by Feynman and others in the early 1980s, such systems may be amenable to future quantum simulations. I will discuss recent advances towards achieving these objectives and the connections to quantum information and other domain sciences.

September 28th, 2021: Universal behavior and strongly coupled theories
“Title TBA”
S. Sachdev – 10am
“Title TBA”
M. Metlitski – 11am
Session chair: Basar


September 21
11:00 am - 12:00 pm